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What was one contribution made by Eratosthenes in ancient Greece

What was one contribution made by Eratosthenes in ancient Greece?
He wrote a geometry textbook that was used for nearly 2,000 years.
He calculated the value of the infinite number known as pi.
He computed the circumference of planet Earth.
He developed military tactics that still apply today.




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What is the capital of Egypt? ( Cairo )

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  1. Eratosthenes is best known for computing the circumference of planet Earth. He made this remarkable calculation by measuring the angle of the Sun’s rays at two different locations in Egypt and using the distance between those locations. This was a pioneering effort in geography and demonstrated an early understanding of the Earth’s size and shape.

  2. Eratosthenes computed the circumference of planet Earth.

    He was a Greek mathematician, astronomer, and geographer who used geometry and measurements of angles from different locations to estimate the Earth’s circumference with remarkable accuracy for his time, around 240 BC. His work was significant in demonstrating the size of the Earth and laid the foundation for future geographical studies.

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